eachMonthOfInterval

// Each month between 6 February 2014 and 10 August 2014:
const result = eachMonthOfInterval({
  start: new Date(2014, 1, 6),
  end: new Date(2014, 7, 10)
})
//=> [
//   Sat Feb 01 2014 00:00:00,
//   Sat Mar 01 2014 00:00:00,
//   Tue Apr 01 2014 00:00:00,
//   Thu May 01 2014 00:00:00,
//   Sun Jun 01 2014 00:00:00,
//   Tue Jul 01 2014 00:00:00,
//   Fri Aug 01 2014 00:00:00
// ]